Summary

Asthma constricts airways in patients' lungs and leaves them short of breath, sometimes fatally; it afflicts tens of millions of people worldwide and seems to be on the rise in many areas. Scientists are still struggling to decipher the cellular signals at the root of the attacks. Now, in reports on pages
336
and
338, immunologists describe a mouse strain that mimics the human condition and might provide a better model system for studying the disease.